Work-clamp.



J. A.-LANDERS.

,WORK CLAMP. APPLICATION FILED SEPT. 6.'t9l6.

1,218,420. Patented Mar. 6, 1917.

3 SHEETS-SHEET I Inn! y 'ln "NEW II fillillllllillll m 5 I 3 I\ 5W 5A IHm I a? o Jams s. A. umpaas. WORK CLAMP.

APPLICATION FILED SEPT- 6, 191 li- Patented Mar. 6, 1917.

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HEW-Ian ale/1s" J. A. LANDERS.

WORK CLAMP.

APPLICATION FILED saw. a, 1916.

Patented Mar. 6, 1917.

3 SHEETS-$HEET 3 ame/wboz Jdzlandefii' JOHN A. LANDERS, or CANTON, onro.

WORK-CLAMP.

Specification of Letters'Patent.

Patented Mar. 6,1917.

Application filed September 6, 1916. Serial No. 118,737.

To all whom it may concern:

Be it known that I, JOHN A. LANDERS, a citizen of the United States,residing at Canton, in the county of Stark and State of Ohio, haveinvented certain new and useful Improvements in \Vork-Clamps, of whichthe following is a specification.

This invention relates to work holders and has for its object theprovision of means whereby the work will be effectually clamped and thenlowered to the point where the finishing or forming operations areperformed and then raised and automatically released. A further objectof the invention is to provide mechanism for the stated purpose whichwill be compact in arrangement and positive and efficient in operation.

The invention is illustrated in the accompanying drawings and will behereinafter fully described, the novel'features being subsequentlyparticularly pointed out in the appended claims. I

In the drawings I Figure l is'a side elevation of my 1mproved apparatusshowing the same in the posiltiion assumed prior to the lowering of thewor Fig. 2 is a similar view showing the work holding aWs in the loweredposition;

Fig. 3 is a vertical longitudinal section showing the parts in theposition illustrated in Fig. 1;

Fig. 4 is a horizontal section on the line H of Fig. 1; V

Fig. 5 is a horizontal section on the line 55 of Fig. 1; r

Fig. 6 is an end elevation; and

Fig. 7 is a transverse section.

In carrying out my invention, I. employ a pair of standards or posts 1,which are connected at their upper ends by a beam or cross-bar 2, thesaid beam being constructed with notches 3 in its ends, which registerwith vertical slots 4 in the upper portions of the standards. A carrierrod 5 is slidabl mounted in the beam 2 and has se cured rigidly to itslowerend in any de sired manner the upper jaw or table 6, which isconstructed with notches in its ends whereby it may fit around andslidably engage the standards 1, as will be readily understood. Withinthe said notches, indi-' cated at 7 I pivot the dogs 8, which have thelowertable or jaw 18 and are construct ed with the enlargements or heads14 which are adapted to, engage under the saidlower table or jaw andthereb'ysupport thesame,

. as shown in 2.. The lower table is constructed at its ends with therecesses-15,:

whereby itmay slidably fit upon theStandards. 1 so as to be guided inits vertical movements. v

Pivotally mounted upon the upper portrons of the standards 1 by pins 16extending therethrough are the upper levers or trip arms 17,".wh1ch areconnected at their outer I ends by cross bars or yokes 18 disposed adjacent the standards and constructed with intermediate lateral arms orextensions19 which have their outer ends pivoted to the upper ends oflinks 20. The lower end of each link 20 is pivoted to the outer end ofan arm or crank 21' projecting from a' rock shaft 22 journaled insuitable brackets 23 on the sides of the standards and upon the ends ofsaid rock shafts,'I secure thelower.

levers'or trip arms 24. Intermediate the ends of the rockshafts, cranks25 depend therefrom and have'their lower ends fitted The inner endsofthese 28 having their lower walls inclined down wardly and inwardly,as shown at 29, tobe, engaged by the lower ends of the dogs 8 and;

thereby move the said dogs into engagement with the lower table or aw.It will be noted that the lower ends of the cranks or arms 25' areenlarged and have convex surfaces to ride upon the walls of the openings26 whereby friction Wlll be mlnimized and the slides may be operatedwithout any tend-u ency'to bind. These enlargements will be so formedand proportioned that the desired engagement between the cranks and theslides will be effected and lateral play of the cranks permitted withoutcausing disengagement of the parts. i i

rum-i Buffers, indicated conventionally at 30, may be provided on thesides of the lowerjaw to prevent forcible contact between the work clampand the fixed part toward which it is moved.

The device is intended more particularly for use in oil-temperingsprings. The springs are placed between dies which are then insertedbetween the jaws or tables 6 and 13 when the parts are in the positionshown in Figs. 1 and 3, the lower table or jaw being supported by theinner ends or the'slides 2'? and the lower ends of the dogs 8 beinghoused within the notches 12 in the ends of the lower table or jaw.After the work has been placed in position, the carrying rod 5 islowered so that the upper table will be brought into contact with theupper side otthe work. This downward movemen' will be transmitteddirectly to the dogs 8 and the lower ends of said dogs will,consequently, be caused to ride downwardly and inwardly upon theinclinedor beveled surfaces 29 of the slides 27, being thereby caused tomove under the lower table 13 so that the enlargements or heads 1% willengage the underside of the said table, as shown in Fig. 2. As thedownward movement continues the upperends of the dogs will clear therollers 10 and the ends of the upper table 6 will impinge against the innor ends of the trip arms or lower levers 24: and cause said levers ortrip arms to swing downwardly, thereby rocking the shafts 22 and causingthe cranks 25 to swing 'outwardly. The outward movement of the cranks 25will, of course, withdraw the slides 27 from below the ends of the lowertable 13 and the said table will then be supported entirely by theenlargements or heads 14 of the dogs 8, and the length of the dogsshould be such that when the table is thus supported the work will befirmly clamped between the upper and lower tables. The withdrawal of theslides 2? permits the upper and lower tables to be moved downwardly toany desired degree, as will be readily understood, and'this downwardmovement is continued until the work is immersed in the oil tank. Afterthe springsare tempered the carrying rod 5 is raised, thereby liftingthe tables 6 and 18 with the work clamped between them. lVhen the lowerlevers or trip arms 2% were swung downwardly by the impact of the uppertable (3, the cranks 21 were swung upwardly and the links 20 transmittedthis movement to the upper arms 19 so that the yoke 18 with the uppertrip arms or levers 17 were swung about the pivots 16 to the positionshown in Fig. 2. When the tables are lifted, the ends ofthe upper table6 will impinge against the downwardly extending inner ends of the upperlevers or trip arms 17, as will be readily understood, moving past thelower levers 24 which are cleared by the table inits downward movement.is the table continues its movement the up per trip arms will be swungupwardly and the parts returned to the position shown in Figs. 1 and 3,so that the slides 27 will be projected under the ends of the table 13to again support the same, and the movement of the parts is so timedthat as the slides move inwardly under the table 13 the upper ends ofthe dogs 8 will engage the rollers 10 and will be swung inwardly so thatthe lower ends of said dogs will be swung outwardly to release the saidlower table. The upper table may continue its upward movementsulliciently to release the work.

It is to noted that in the drawings T have illustrated strikers orprojections 31 on the upper side of the table 6 at the ends thereofwhich will impinge against the ends 01 the upper trip arms or levers 17when the table moves upwardly so that the said levers will be actuatedbefore the dogs release the lower table 13, and, consequently, theslides 27 will be projected under the table in ample season to preventdropping of the same. This arrangement also provides for a limitedmovement of the upper table independently of the lower table so that thetables may be separated sufiiciently to permit the insertion and removalof the work without requiring any special mechanism for this particularpurpose and without causing premature operation of the slides 27 Theparticular form of the brackets or strikers 31 is immaterial and 1 donot limit myself to any particular disposition of these elements as theymay be varied at will and might, under some conditions, be omittedentirely. Other changes in the minor details of the construction andarrangement may be made without involving any departure from the spiritor scope of the invention as the same is defined in the followingclaims.

Having thus described the invention, what is claimed as new is: v

1. in a device for the purposeset forth, the combination of awork-engaging mcm her, means connected with said member to effectmovement of the same, a second workengaging member, means carried byfirstmentioned member to engage and support the second member, means forreleasing'said engaging and supporting means, and other means forsupporting the second-mentioned work-engaging member after said engagingand supporting means is released.

2. In a device for the purpose set forth, the combination ofwork-engaging mem bers, dogs mounted upon one of said members to engagethe other member and lock it against the work, means acting upon saiddogs during a portion of their travel to release them from thelast-mentioned workengaging member, and means for supporting said memberwhen at rest and adapted to actuate the dogs during a portion of thetravel of the same to engage said work-enwork-engaging member when thesame is at rest constructed to act upon the dogs and move them intoengagement with said member, and means interposed in the path ofmovement of the dogs to release them from said work-engaging member.

4. In a device for the purpose set forth, the combination of a pair ofwork-engaging members, means connected with one of said members toreciprocate the same, dogs pivoted to the ends of said member andconstructed to engage the other member, and means whereby upon movementof the members in one direction the dogs will be released and uponmovement of the members in the opposite direction the dogs will becaused to engage and support the work-em gaging member and cause themembers to move in unison.

5. In a device for the purpose set forth, the combination ofreciprocable work-engaging members, supports mounted to move across thepath of movement of saidrworkengaging members to support one of saidwork-engaging members when it is at rest, dogs carried by the other ofsaid work-engaging members and adapted to engage under thefirst-mentioned work-engaging member, and means whereby upon movement ofthe work-engaging members in one direction the said supports will bewithdrawn and the dogs engaged and upon movement of the members in theoppositedirection, the dogs will be released and the supports projected.

6. In a device for the purpose set forth, the combinatio of workengagingmembers, means for imparting reciprocatory movement to said members,dogs carried by the upper member and constructed to engage and supportthe lower member, means above the upper member for releasing said dogsfrom the lower member, slides adapted to support the lower member whenit is at rest and constructed to cause the dogs to engage said memberupon downward movement of Copies of this patent may be obtained for fivecents each, by addressing the Commissioner of Patents,

the upper work-engaging member, upper and lower trip arms projectinginto the path of the said upper work-engaging member, and means wherebywhen the lower trip arms are actuated by said upper work-engaging memberthe said slides will be withdrawn and when the upper trip arms areactuated the said slides will be projected.

7. In a device for the purposeset forth, the combination of upper andlower workengaging members, means for clamping the lower member to theuppermembel', means for releasing said clamping means, ;upper and lowertrip arms adaptedto pro ject into the path of movementof the upperwork-engaging member, rock shafts carrying the lower trip arms, slidesadapted to support the lower work-engaging member when it is at rest andto be engaged by the said clamping means to cause said means to engagesaid lower work-engaging member, cranks carried by the said rock shaftstween the upper and lower trip arms.

8. In a device for the purpose set forth, the combination of upper andlower workengaging members, dogs pivoted to the upper work-engagingmember and constructed at their lower ends to en age under the lowerwork-engaging 'mem er, slides disposed to support the lowerwork-engaging member when it is at rest and having cam surfaces arrangedto be engaged by the said dogs whereby they will be caused to engageunder the lower work-engaging member, means for withdrawing said slidesto permit movement of the work-engaging members, and means for releasingthe said dogs at one limit of movement of the work-engaging JOHN A.LANDERS. [L. s]-

Washington, D. O."

- and fitted to said slides, and connections bei

